Knee Replacement vs Save the Knee — How to Decide

The Knee Grading System — Grades 1–4 Explained Simply

Before any knee treatment decision can be made responsibly, you need to understand where your knee sits on the Kellgren-Lawrence grading scale — the internationally recognised system for classifying the severity of knee osteoarthritis on X-ray. This scale has four grades, and the treatment decision changes dramatically depending on where you fall.

Grade 1: Doubtful narrowing of joint space. Minor osteophyte formation. Most patients at this stage have occasional pain — manageable with lifestyle modification and physiotherapy. There is no structural damage that requires any intervention. Changing the way you load the knee, losing weight, and strengthening the quadriceps muscles is usually sufficient to resolve symptoms entirely. Surgery at Grade 1 is never appropriate.

Grade 2: Definite osteophyte formation, possible narrowing of the joint space. Pain typically occurs on activity and there is stiffness in the morning that resolves within 30 minutes. Critically, cartilage is still present at Grade 2. PRP (Platelet Rich Plasma) injections combined with physiotherapy are highly effective at this stage. Multiple well-designed randomised controlled trials demonstrate meaningful improvement in pain and function lasting 12–18 months. Surgery is inappropriate at Grade 2 in the vast majority of patients — it is premature and preventable.

Grade 3: Multiple osteophytes, definite narrowing, some sclerosis of the bone. This is moderate-to-severe arthritis. Cartilage is significantly reduced but still present in parts of the joint. Patients have moderate-to-severe pain that limits activity. At Grade 3, PRP combined with stem cells and physiotherapy can still produce 1–3 years of meaningful clinical improvement in selected patients. Surgery may eventually become necessary — but it should not be rushed. A proper 100-day non-surgical programme should be the first step.

Grade 4: Large osteophytes, marked narrowing, severe sclerosis, and possible bony deformity. This is bone-on-bone contact. Cartilage is essentially absent. Conservative treatment — including PRP and physiotherapy — provides only limited benefit at Grade 4, because there is no cartilage left to protect or stimulate. This is the grade where replacement is genuinely indicated. However, even here, the clinical picture must correlate with symptoms: a Grade 4 X-ray in a patient with mild symptoms and good function may not need surgery immediately.

The critical principle to carry forward: "A Grade 4 X-ray does not automatically mean surgery tomorrow. But it does mean the non-surgical window has largely closed. A Grade 2 or 3 X-ray with pain does NOT mean surgery — it means the non-surgical window is open and should be used."

Who Should Try the 100 Days Save the Knee Programme First

The 100 Days Save the Knee Programme at Gini Hospital is a structured, evidence-based non-surgical pathway for patients with knee arthritis. The question of who is the right candidate is one Dr. Harjoban Singh addresses at every new patient consultation.

The programme is appropriate when the following criteria are met:

• Grade 1, 2, or 3 arthritis confirmed on weight-bearing X-rays (lying-down X-rays underestimate joint space narrowing and can mislead).
• Pain that limits activity but does not prevent basic daily function entirely — the patient can still walk, albeit with discomfort.
• No significant varus or valgus deformity — leg angulation beyond 15° reduces the effectiveness of non-surgical management.
• BMI below 40 — higher BMI significantly reduces the efficacy of PRP injections, as chronic systemic inflammation from obesity blunts the growth factor response.
• Patient commitment to the full programme, including the lifestyle and physiotherapy components. Non-surgical treatment requires active patient participation — it does not work passively.
• Age 40–75 — younger patients in particular benefit enormously from saving the native joint. A 45-year-old patient who has a knee replacement today may need a revision surgery in their 60s. Every year the native joint can be preserved is clinically valuable.

There are patients who can appropriately move directly to discussing surgery:

• Grade 4 bone-on-bone arthritis with severe deformity AND documented failure of at least 6 months of proper conservative treatment including physiotherapy and PRP.
• Significant ligamentous instability (ACL/PCL failure combined with Grade 4 changes) where the joint is structurally unsalvageable without replacement.
• Inflammatory arthritis (rheumatoid arthritis) that is not controlled medically — here the underlying disease process must be managed first, and the joint decision made with a rheumatologist's input.

For everyone else — the default should be a serious, committed non-surgical programme before replacement is even discussed.

What Happens in the Programme — PRP, Stem Cells, and Physiotherapy

The 100 Days Save the Knee Programme at Gini is structured across three phases. It is not simply "a PRP injection and some exercises" — it is a methodical, documented programme with measurable milestones at each stage.

Phase 1: Assessment and Physiotherapy Foundation (Weeks 1–4)

The programme begins with a comprehensive assessment: full gait analysis to identify abnormal loading patterns, weight-bearing X-rays of both knees, inflammation markers (CRP and ESR), joint fluid assessment where indicated, and a functional pain score at baseline. Physiotherapy begins immediately in the first week — quadriceps strengthening, hamstring stretching, gait correction exercises, and proprioception training (balance board, single-leg standing). This phase establishes the structural support the joint needs before injections are introduced.

Phase 2: PRP Injections and Stem Cells (Weeks 4–8)

PRP — Platelet Rich Plasma: The patient's own blood is drawn and centrifuged to concentrate platelets and their associated growth factors (PDGF, TGF-beta, VEGF, IGF). This concentrated plasma is injected directly into the joint space under ultrasound guidance. The growth factors reduce synovial inflammation, stimulate cartilage repair mechanisms, and modulate the local immune environment. For Grade 2–3 arthritis, 2–3 injections at 4-week intervals are the standard protocol.

The evidence for PRP is now substantial. The 2021 Cochrane systematic review found PRP superior to both hyaluronic acid (viscosupplementation) and corticosteroid injections for knee osteoarthritis pain and function at both 6 and 12 months. This is Level 1 evidence — the highest standard in clinical research.

Stem Cells (Grade 2–3, selected cases): Mesenchymal stem cells derived from the patient's own bone marrow or adipose (fat) tissue are concentrated and injected into the joint space. These cells can stimulate cartilage repair and reduce synovial inflammation through paracrine signalling. Results take 3–6 months to become fully apparent. Stem cell therapy is offered in cases where Grade 3 changes are present and PRP alone may be insufficient to produce meaningful improvement.

Phase 3: Reassessment and Long-Term Protocol (Weeks 8–14)

At week 8, a structured reassessment evaluates pain scores, function, and range of motion. A second PRP injection is administered where indicated. Advanced physiotherapy progresses to sport-specific and functional movements. The lifestyle protocol — weight management, low-impact exercise (swimming, cycling), dietary modification — is reinforced as a long-term commitment, not a temporary measure.

For patients who want to understand the full knee replacement pathway, the dedicated page at Knee Replacement Mohali provides complete information on the surgical procedure, implant types, and what to expect.

Who Genuinely Needs Knee Replacement Surgery

There is a subset of patients for whom knee replacement is the appropriate and necessary answer. Being clear about this is as important as being clear about who should avoid it. Recommending against unnecessary surgery is not the same as recommending against surgery in all cases.

Knee replacement is genuinely appropriate when all of the following conditions are met:

1. Grade 4 arthritis confirmed on weight-bearing X-ray, ideally corroborated by MRI showing complete cartilage loss and significant bone changes. Weight-bearing films are non-negotiable — a lying-down film can underestimate severity by one full grade.
2. Conservative treatment has genuinely failed — minimum 6 months of proper physiotherapy with a qualified physiotherapist, and PRP injections where appropriate (at least 2 sessions, 4 weeks apart). "I took some painkillers and rested" does not constitute a serious conservative trial.
3. Pain significantly limits daily function — difficulty walking 100 metres, inability to climb stairs without severe pain, or sleep being disturbed nightly by knee pain are appropriate thresholds. Mild-to-moderate limitation alone is not sufficient.
4. No serious medical contraindications to major surgery — cardiac, renal, or infectious risk factors that preclude safe anaesthesia and recovery must be evaluated and addressed first.
5. The patient has a realistic understanding of the recovery timeline and the long-term functional ceiling after replacement.

What knee replacement genuinely achieves: excellent pain relief in 95%+ of patients, significant restoration of function for daily activities, and an implant lifespan of 15–20 years with modern prosthetics and good surgical technique. Walking, swimming, cycling — yes. Running and jumping — no. This is an important expectation to set before surgery, not after.

"A FIFA-approved orthopaedic surgeon who recommends surgery only when truly needed is the most trustworthy second opinion you can get. The question is not 'can we do this surgery?' but 'do we need to do this surgery yet?'" — Dr. Harjoban Singh, MS Orthopaedics, FIFA-certified Sports Medicine Physician

What Robo-Navigation Surgery Changes About the Outcome

When knee replacement is the correct decision, surgical technique matters enormously for long-term outcomes. The single most important technical variable is component alignment — how precisely the artificial knee components are positioned relative to the mechanical axis of the leg.

Traditional knee replacement depends on the surgeon's skill and manual measurements taken during the operation. The average alignment error with conventional technique is 2–3 degrees. This sounds small, but in joint replacement it is significant: even 3 degrees of misalignment changes how load is distributed across the implant surface. Over years and hundreds of thousands of steps, misalignment accelerates wear, shortens implant lifespan, and produces suboptimal functional outcomes.

Robo-Navigation with the GiniVision™ AR system works differently. Pre-operatively, a CT scan is used to build a 3D model of the patient's specific knee anatomy. A surgical plan is created based on this model — not generic population averages. During surgery, augmented reality guidance confirms the position of each component in real-time before it is fixed, ensuring alignment within 0.5° consistently. This level of precision is not achievable through manual technique alone.

Studies comparing robo-navigation knee replacement to conventional technique demonstrate approximately 40% lower revision rates at 10 years in the robo-navigation group. The procedure adds 15–20 minutes to total surgical time — a marginal investment for meaningfully better long-term outcomes.

At Gini, Dr. Harjoban Singh performs all knee replacements using the Robo-Navigation system. Bilateral knee replacement — both knees in the same anaesthetic session — is also available for selected patients, reducing total recovery time compared to two separate procedures. Full details on the surgical approach are available at Knee Replacement Mohali.

The Right Question to Ask Your Surgeon Before Agreeing to Surgery

Knee replacement is one of the most commonly performed orthopaedic procedures in India, and it is also one of the most commonly performed prematurely. If you have been told you need knee replacement surgery, there is one question you should ask before agreeing:

"What non-surgical options have we genuinely exhausted, and how long did we try them for?"

A responsible surgeon should be able to answer this question specifically:

• "We tried physiotherapy for at least 12 weeks with a qualified physiotherapist, and documented the outcome."
• "We tried PRP injections — at least 2 sessions, 4 weeks apart."
• "We tried weight management — BMI reduction has been formally attempted."
• "Your X-ray shows Grade 4 changes confirmed on a weight-bearing film — not a lying-down film."

If the answer to your question is "your X-ray shows some narrowing, you should have surgery soon" — without specific reference to a failed conservative programme — get a second opinion. Urgency about knee replacement surgery (except in rare cases of acute fracture or rapidly destructive inflammatory arthritis) is a red flag, not a green light. Knee osteoarthritis progresses over years, not days. There is almost always time for a second opinion.

At Gini, Dr. Harjoban Singh offers a Surgical Necessity Second Opinion — a dedicated consultation specifically to review prior imaging and treatment history, and give an independent, evidence-based assessment of whether surgery is the right next step or whether a non-surgical programme remains viable.